22. Lake Grassmere Salt Works Zone Volume Two 22.3.7.8. After reasonable mixing, filling must not cause any conspicuous change in the colour or visual clarity of any flowing river, measured as follows: (a) hue must not be changed by more than 10 points on the Munsell scale; (b) the natural clarity must not be conspicuously changed due to sediment or sediment laden discharge originating from the filling site; (c) the change in reflectance must be <50%. 22.3.8. Indigenous vegetation clearance. 22.3.8.1. Indigenous vegetation clearance must comply with Standards 22.3.9.1 to 22.3.9.8 (inclusive). 22.3.8.2. The clearance of indigenous vegetation in the following circumstances is exempt from Standards 22.3.8.3 to 22.3.8.6 (inclusive): (a) indigenous vegetation dominated by manuka, kanuka, tauhinu, bracken fern and silver tussock, and which has grown naturally from previously cleared land (i.e. regrowth) and where the regrowth is less than 20 years in age; (b) indigenous vegetation dominated by matagouri, and which has grown naturally from previously cleared land (i.e. regrowth) and where the regrowth is less than 50 years in age; (c) where the clearance is associated with the maintenance of an existing road, forestry road, harvesting track or farm track. 22.3.8.3. Clearance of indigenous vegetation must not occur: (a) on land identified as a Threatened Environments – Indigenous Vegetation Site; (b) on land above mean high water springs that is within 20m of an Ecologically Significant Marine Site. 22.3.8.4. Clearance of indigenous vegetation within the coastal environment must not include the following habitats/species: (a) duneland vegetation; (b) coastal grassland; (c) coastal flaxlands; (d) coastal vegetation dominated by (making up >50% of the canopy cover) wharariki/coastal flax (Phormium cookianum); (e) coastal broadleaved shrubland; (f) coastal small-leaved shrubland; (g) coastal salt turf; (h) coastal speargrass herbfield. 22.3.8.5. Clearance of indigenous forest must not exceed 1000m per Computer 2 Register in any 5 year period. 22.3.8.6. Clearance of indigenous vegetation, per Computer Register, must not exceed: 22 – 6